Insight into framework destruction in ultramarine pigments

Eleonora Del Federico; Wolfgang Shöfberger; Johannes Schelvis; Sofia Kapetanaki; Lindsey Tyne; Alexej Jerschow

doi:https://doi.org/10.1021/ic050903z

Insight into framework destruction in ultramarine pigments

Eleonora Del Federico, Wolfgang Shöfberger, Johannes Schelvis, Sofia Kapetanaki, Lindsey Tyne, Alexej Jerschow

Chemistry and Biochemistry

Montclair State University

Research output: Contribution to journal › Article › peer-review

44 Scopus citations

Abstract

We report key evidence on the framework destruction in ultramarine pigments upon color fading. Experiments on faded pigments in a fresco painting environment reveal that the paramagnetic chromophores are set free via sodalite framework destruction and are subsequently degraded. Fading in acidic media produces similar results, although a larger number of β-cages appear to be destroyed, and H₂S is released. The findings are further supported by studies on natural and synthetic ultramarine pigments of various shades via solid-state resonance-Raman spectroscopy, colorimentry, and solid-state ²⁹Si and ²⁷Al NMR spectroscopy. NMR parameters are shown to correlate well with the intensities of Raman signals corresponding to the S₃^-. chromophores. A further correlation is established between the colorimetric parameters, L* (lightness) and C* (chroma), and the paramagnetic shift and paramagnetic linebroadening in NMR spectra for both ²⁷Al and ²⁹Si.

Original language	English
Pages (from-to)	1270-1276
Number of pages	7
Journal	Inorganic Chemistry
Volume	45
Issue number	3
DOIs	https://doi.org/10.1021/ic050903z
State	Published - Feb 6 2006

ASJC Scopus subject areas

Physical and Theoretical Chemistry
Inorganic Chemistry

Access to Document

https://doi.org/10.1021/ic050903z

Cite this

@article{2f87d310d08442e48f193ecf1a30747d,

title = "Insight into framework destruction in ultramarine pigments",

abstract = "We report key evidence on the framework destruction in ultramarine pigments upon color fading. Experiments on faded pigments in a fresco painting environment reveal that the paramagnetic chromophores are set free via sodalite framework destruction and are subsequently degraded. Fading in acidic media produces similar results, although a larger number of β-cages appear to be destroyed, and H2S is released. The findings are further supported by studies on natural and synthetic ultramarine pigments of various shades via solid-state resonance-Raman spectroscopy, colorimentry, and solid-state 29Si and 27Al NMR spectroscopy. NMR parameters are shown to correlate well with the intensities of Raman signals corresponding to the S3-. chromophores. A further correlation is established between the colorimetric parameters, L* (lightness) and C* (chroma), and the paramagnetic shift and paramagnetic linebroadening in NMR spectra for both 27Al and 29Si.",

author = "{Del Federico}, Eleonora and Wolfgang Sh{\"o}fberger and Johannes Schelvis and Sofia Kapetanaki and Lindsey Tyne and Alexej Jerschow",

year = "2006",

month = feb,

day = "6",

doi = "https://doi.org/10.1021/ic050903z",

language = "English",

volume = "45",

pages = "1270--1276",

journal = "Inorganic Chemistry",

issn = "0020-1669",

publisher = "American Chemical Society",

number = "3",

}

TY - JOUR

T1 - Insight into framework destruction in ultramarine pigments

AU - Del Federico, Eleonora

AU - Shöfberger, Wolfgang

AU - Schelvis, Johannes

AU - Kapetanaki, Sofia

AU - Tyne, Lindsey

AU - Jerschow, Alexej

PY - 2006/2/6

Y1 - 2006/2/6

N2 - We report key evidence on the framework destruction in ultramarine pigments upon color fading. Experiments on faded pigments in a fresco painting environment reveal that the paramagnetic chromophores are set free via sodalite framework destruction and are subsequently degraded. Fading in acidic media produces similar results, although a larger number of β-cages appear to be destroyed, and H2S is released. The findings are further supported by studies on natural and synthetic ultramarine pigments of various shades via solid-state resonance-Raman spectroscopy, colorimentry, and solid-state 29Si and 27Al NMR spectroscopy. NMR parameters are shown to correlate well with the intensities of Raman signals corresponding to the S3-. chromophores. A further correlation is established between the colorimetric parameters, L* (lightness) and C* (chroma), and the paramagnetic shift and paramagnetic linebroadening in NMR spectra for both 27Al and 29Si.

AB - We report key evidence on the framework destruction in ultramarine pigments upon color fading. Experiments on faded pigments in a fresco painting environment reveal that the paramagnetic chromophores are set free via sodalite framework destruction and are subsequently degraded. Fading in acidic media produces similar results, although a larger number of β-cages appear to be destroyed, and H2S is released. The findings are further supported by studies on natural and synthetic ultramarine pigments of various shades via solid-state resonance-Raman spectroscopy, colorimentry, and solid-state 29Si and 27Al NMR spectroscopy. NMR parameters are shown to correlate well with the intensities of Raman signals corresponding to the S3-. chromophores. A further correlation is established between the colorimetric parameters, L* (lightness) and C* (chroma), and the paramagnetic shift and paramagnetic linebroadening in NMR spectra for both 27Al and 29Si.

UR - http://www.scopus.com/inward/record.url?scp=32544453260&partnerID=8YFLogxK

U2 - https://doi.org/10.1021/ic050903z

DO - https://doi.org/10.1021/ic050903z

M3 - Article

C2 - 16441139

SN - 0020-1669

VL - 45

SP - 1270

EP - 1276

JO - Inorganic Chemistry

JF - Inorganic Chemistry

IS - 3

ER -

Insight into framework destruction in ultramarine pigments

Abstract

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this